Fluid Mechanics & Hydraulics MCQs with Answers & Solutions — Page 4

Which of the following is the least incompressible fluid?Fluid Properties

Find the ratio of celerity when surge moving upstream to when surge moving downstream, if ratio of initial velocity of stream to velocity of surge is…Hydraulic Machines

Uniform flow is possible in which of the following cases?Open Channel Flow

If the width of a rectangular channel is twice its depth of flow, then the depth of the flow 'y' varies with discharge 'q' as (consider all…Open Channel Flow

The head loss in a sudden expansion from 6 cm diameter pipe to 12 cm diameter pipe, in terms of velocity v₁ in the 6 cm diameter pipe isFlow Through Pipes

The pressure rise due to water hammer caused by sudden closure of the discharge (of velocity v) through the rigid pipe is (assume, fluid density as…Flow Through Pipes

Two pipes of same length and diameters d and 2d are connected in series. The diameter of equivalent pipe of same length isFlow Through Pipes

With increasing aging of pipes, the ratio of maximum velocity to mean velocity in turbulent flowTurbulent Flow

In a laminar flow through a circular pipe of diameter 20 cm, the maximum velocity is found to be 2 m/s. The velocity at a radial distance of 5 cm…Laminar Flow

If U₀ is the free stream velocity and the velocity on the surface of the cylinder (U_C) of radius r due to circulation (Γ) is Γ/(2πr), then for…Flow Past Immersed Bodies

The discharge in an open channel is generally measured byFlow Measurement

For laminar flow in circular pipe the ratio of net power input to volume varies as _______ (where, R = radius of circular pipe)Laminar Flow

In a dynamic equation for GVF in a channel, the water surface slope relative to bottom, bed slope of channel and slope of total energy line are…Gradually Varied Flow

One end of a two-dimensional water tank has the shape of a quadrant of a circle of radius 2.5 m. When the tank is full, the vertical component of the…Hydrostatic Forces on Surfaces

Which of the following part of Pelton turbine actively helps in meeting the variable demand of power?Hydraulic Machines

If a reciprocating pump having a mechanical efficiency of 75% delivers water at the rate of 80 kg/s with a head of 25 m, the brake power of the pump…Hydraulic Machines

If a turbine of 5 m runner diameter and 361 m head is running at 150 rpm, the speed of a geometrically similar turbine of 1 m runner diameter working…Hydraulic Machines

A five cylinders reciprocating pump raises the water level by 100 m and the theoretical discharge is 0.2 m³/s. The velocity in the delivery pipe is 2…Hydraulic Machines

The maximum permissible suction lift for centrifugal pump in practice isHydraulic Machines

Before starting the centrifugal pumps, usually they require priming. Priming is the process ofHydraulic Machines

Manometer is used to measureFluid Statics

A Piezometer tube is used only for measuringFluid Statics

The metacentric height is the distance between theBuoyancy and Floatation

Concept of boundary layer was first introduced byBoundary Layer Theory

Which of the following is correct dimension for dynamics viscosity(μ)?Fluid Properties

Reynold’s number is defined as theDimensional Analysis and Similitude

A Newtonian fluid is defined as the fluid whichFluid Properties

Which of the following assumptions are made in the analysis of hydraulic jump?Hydraulic Jump

If ‘m’ is hydraulic mean depth and ‘d’ is a depth of flow, then the discharge through rectangular channel is maximum whenOpen Channel Flow

Venturi meter is used to measureFlow Measurement

The overall efficiency of turbine is the ratio ofHydraulic Machines

Francis turbine isHydraulic Machines

Air vessel in a reciprocating pump is usedHydraulic Machines

The drag force experienced by an object isFlow Past Immersed Bodies

Newton’s law of viscosity states thatFluid Properties

Reynold’s number is defined as theDimensional Analysis and Similitude

Lift force (FL) is expressed mathematically, asFlow Past Immersed Bodies

Drag is defined as the force exerted by a flowing fluid on a slid bodyFlow Past Immersed Bodies

If the density of a fluid changes from point to point in a flow region, it is calledFluid Kinematics

The boundary layer takes placeBoundary Layer Theory

The critical depth (hc) is given by, where q = Rate of flow per unit width of channelSpecific Energy in Open Channel Flow

Francis turbine isHydraulic Machines

The work saved by fitting an air vessel to a single acting reciprocating pump isHydraulic Machines

A pump is defined as a device which convertsHydraulic Machines

Which of the following statements is/are true? i. Dynamic viscosity is the resistance to movement of one layer of a fluid over another. ii. The unit…Fluid Properties

_______ are the loci of points of all the fluid particles that have passed continuously through a particular spatial point in the past.Fluid Kinematics

The friction factor of laminar liquid flow in a circular pipe is inversely proportional toLaminar Flow

The shear stress in a fully developed laminar flow in a circular pipeLaminar Flow

Which of the following statements is/are true? i. Control section is defined as a section in which a fixed relationship exists between the discharge…Gradually Varied Flow

If the flow characteristics such as flow depth and the velocity of flow at any point do not change with respect to time, then it is known asFluid Kinematics